EP1238862A2 - Kraftfahrzeugstossfängerstruktur - Google Patents

Kraftfahrzeugstossfängerstruktur Download PDF

Info

Publication number
EP1238862A2
EP1238862A2 EP02005222A EP02005222A EP1238862A2 EP 1238862 A2 EP1238862 A2 EP 1238862A2 EP 02005222 A EP02005222 A EP 02005222A EP 02005222 A EP02005222 A EP 02005222A EP 1238862 A2 EP1238862 A2 EP 1238862A2
Authority
EP
European Patent Office
Prior art keywords
bumper
cross member
rib
impact
impact absorbing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP02005222A
Other languages
English (en)
French (fr)
Other versions
EP1238862B1 (de
EP1238862A3 (de
Inventor
Kenichi Fuji Jukogyo K. K. Satou
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Subaru Corp
Original Assignee
Fuji Jukogyo KK
Fuji Heavy Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fuji Jukogyo KK, Fuji Heavy Industries Ltd filed Critical Fuji Jukogyo KK
Publication of EP1238862A2 publication Critical patent/EP1238862A2/de
Publication of EP1238862A3 publication Critical patent/EP1238862A3/de
Application granted granted Critical
Publication of EP1238862B1 publication Critical patent/EP1238862B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
    • B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
    • B60R19/18—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects characterised by the cross-section; Means within the bumper to absorb impact
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/34—Protecting non-occupants of a vehicle, e.g. pedestrians
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
    • B60R19/56—Fittings damping bouncing force in truck collisions, e.g. bumpers; Arrangements on high-riding vehicles, e.g. lorries, for preventing vehicles or objects from running thereunder
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
    • B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
    • B60R19/18—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects characterised by the cross-section; Means within the bumper to absorb impact
    • B60R2019/186—Additional energy absorbing means supported on bumber beams, e.g. cellular structures or material
    • B60R2019/1873—Cellular materials

Definitions

  • the present invention relates to a bumper structure in which an impact can be absorbed even at a lower portion of a bumper.
  • front bumpers for vehicle bodies in each of which protection of a pedestrian is taken into consideration.
  • the front bumpers are formed in such a manner that an impact can be absorbed at a lower portion of the bumper as well as at an upper portion thereof.
  • a bracket is interposed between a bumper face and a cross member so that it fastens a lower portion of the bumper face to the cross member on a vehicle body.
  • the bracket has a plurality of mounting surfaces to overlap a front surface of the cross member.
  • the bracket has pairs of vertical surfaces extending forward from both sides of the respective mounting surfaces in a direction substantially normal to a transverse direction of the vehicle.
  • the mounting surfaces and the vertical surfaces are formed integrally with the bracket.
  • the cross member is mounted to the bracket at the mounting surface. According to this technology, the respective vertical surfaces function as impact absorbing members at the lower portion of the bumper face.
  • the present invention was made in these situations, and an object of the present invention is to provide a bumper structure in which a lower portion of a bumper face can fasten to a cross member.
  • the object of the present invention is also to provide an appropriate impact absorbing function at the lower portion of the bumper face with a simple structure and without increasing the number of components.
  • a bumper structure comprising: a bumper face; a cross member mounted on a vehicle body; an under cover disposed at a lower portion of the vehicle body, and extended forward so as to become a bracket for fastening a lower portion of the bumper face to the cross member; and a lower impact absorbing member formed integrally with the under cover, and disposed between the lower portion of the bumper face and the cross member for absorbing an impact between the cross member and the bumper face.
  • a bumper structure as set forth in the first aspect of the present invention, wherein the lower impact absorbing member comprises: a rib provided to be opposed to the lower portion of the bumper face; and a plurality of beads disposed between the rib and the cross member for transmitting the impact from the rib to the cross member, and wherein the rib and the beads are formed integrally with the under cover.
  • a bumper structure as set forth in the second aspect of the present invention, wherein the rib extends in substantially parallel with the lower portion of the bumper face in a transverse direction of the vehicle body.
  • a bumper structure as set forth in the second or third aspect of the present invention which further comprising: a bumper beam mounted on the vehicle body; and an upper impact absorbing member disposed between an upper portion of the bumper face and the bumper beam for absorbing impact between the bumper beam and the upper portion of the bumper face, wherein a position where the rib is disposed is forward of a predetermined position where an impact absorption by the upper impact absorbing member is saturated, when the upper impact absorbing member is pressed to the bumper beam side.
  • a bumper structure as set forth in any one of the second to fourth aspects of the present invention, wherein the length of the rib is disposed longer than that of the cross member in a transverse direction of the vehicle body, and wherein the beads are disposed along the rib in a sectorial shape.
  • each of the beads has a locking pawl to be locked at a locking portion protruded forward from the cross member.
  • a bumper structure as set forth in the sixth aspect of the present invention, wherein the locking pawl is formed by cutting away a rear portion of the bead.
  • a bumper structure as set forth in the sixth or seventh aspect of the present invention, the cross member comprising: a first member having a flange; and a second member having a flange that is joined with the flange of the first member,wherein the locking portion is formed by the flange of the first and second members.
  • Fig. 1 is a longitudinally vertical sectional view showing a main part of a vehicle body in the vicinity of a front bumper.
  • Fig. 2 is an exploded perspective view of a cross member and an under cover.
  • Fig. 3 is a plan view showing the main part of the under cover which corresponds to a horizontal sectional view taken along the line I-I in Fig. 1.
  • Fig. 4 is longitudinally vertical sectional view showing a main part of a lower portion of the bumper.
  • reference numeral 1 denotes a vehicle body and reference numeral 2 denotes a front bumper disposed at a front end of the body 1.
  • the front bumper 2 has a bumper face 5 made from resin.
  • the bumper face 5 has an upper protruding portion 6 and a lower protruding portion 7, which protrude at positions spaced a predetermined interval each other in a vertical direction of the bumper face 5. Therefore, the front bumper 2 is designed to hit against legs of a pedestrian at first, when the pedestrian is hit from the front face of the vehicle.
  • An upper portion of the bumper face 5 extends to a rear of the body 1 from a top of the upper protruding portion 6 and is fixedly mounted to a bumper beam 10 of the body 1 through clips 11.
  • an upper impact absorbing member 12 made of foamed resin etc. is fixedly provided on a front side of the bumper beam 10, so that the upper impact absorbing member 12 is accommodated in the upper protruding portion 6.
  • a plurality of protruding pieces 15 are formed on an inner surface of the lower protruding portion 7. These protruding pieces 15 are fastened to the body 1 through a resin under cover 17 fixedly provided at a lower portion of the body 1.
  • a cross member 20 and an engine cross member 21 are disposed at the lower portion of the body 1.
  • the cross member 20 is at a forward portion of the vehicle and the engine cross member 21 is at a rear portion of the cross member 20.
  • a front portion of the under cover 17 is fastened to the cross member 20 through clips 22, whereas a rear portion of the under cover 17 is fastened to the engine cross member 21 through a bolt 23.
  • the front portion of the under cover 17 extends forward further than the cross member 20 so that the extended portion of the under cover becomes a mounting bracket 25 for the bumper face 5.
  • the bracket 25 faces the inner surface of the lower protruding portion 7 of the bumper face 5.
  • the protruding pieces 15 of the lower protruding portion 7 are fastened to the bracket 25 at hole portions 25a formed in a distal end of the bracket 25 through clips 26.
  • the lower portion of the bumper face 5 is fastened to the cross member 20 of the body 1 through the bracket 25 extending from the under cover 17.
  • a lower impact absorbing member 30 is integrally formed on the bracket 25, so that the lower impact absorbing member 30 is accommodated in the lower protruding portion 7.
  • the lower impact absorbing member 30 has a rib 31 raised from the bracket 25 so as to be opposed to an inner vertical surface of the lower protruding portion 7 and a plurality of beads 32.
  • the beads 32 are disposed between the rib 31 and the cross member 20 for transmitting an impact from the rib 31 to the cross member 20.
  • a length of the rib 31 in the transverse direction of the vehicle is set so as to substantially correspond to a transverse length of the cross member 20.
  • the rib 31 is extended along the inner vertical surface of the lower protruding portion 7 in substantially parallel therewith and spaced a predetermined interval from the inner vertical surface.
  • the rib 31 is disposed forward of a position P 1 where impact absorption by the upper impact absorbing member 12 is saturated.
  • the beads 32 are hollow rectangular protruding members extending in the longitudinal direction of the body 1.
  • the beads 32 are formed integrally with the rib 31 at front end portions thereof, whereas the beads 32 abut on a front side of the cross member 20 at rear end portions thereof.
  • the cross member 20 has an upper member 20a, a lower member 20b and a flange joined portion 20c.
  • the upper member 20a and the lower member 20b are joined together at front portions of the upper and lower members .
  • the upper member 20a and the lower member 20b are also joined together at rear portions of the upper and lower members.
  • flanges are formed at the front portion and the rear portion respectively.
  • the flange joined portion 20c located on a front side of the cross member 20.
  • Upper surfaces of the respective beads 32 are abutted with a flange joined portion 20c on a front side of the cross member 20.
  • the lower impact absorbing member 30 forms a low impact absorbing zone 35 and a high impact absorbing zone 36 in the interior of the lower protruding portion 7 by the rib 31 and the beads 32.
  • a strength of the high impact absorbing zone 36 is set greater than that of the upper impact absorbing member 12 by the rib 31 and the beads 32.
  • the legs of the pedestrian are hit first by the upper protruding portion 6 and the lower protruding portion 7 formed on the bumper face 5 of the front bumper 2.
  • Portions of the legs near the knees are hit mainly by the upper protruding portion 6, then the upper protruding portion 6 is deformed to the rearwards of the body 1 while absorbing an impact from the portion of the leg near the knee. Furthermore, the impact is then transmitted to the upper impact absorbing member 12, then the upper impact absorbing member 12 is deformed while absorbing the impact.
  • portions of the legs below the knees are hit mainly by the lower protruding portion 7.
  • the lower protruding portion 7 is deformed to the rearwards of the body 1 while absorbing an impact from the portions of the legs below the knees at the lower impact absorbing zone 35.
  • the impact absorption at the low impact absorbing zone 35 is saturated, the impact is then absorbed by the high impact absorbing zone 36 (refer to Fig. 4B).
  • an impact absorption initiating position (where the rib 31 is disposed) of the high impact absorbing zone 36 is set forwarder than the position where impact absorption by the upper impact absorbing member 12 is saturated.
  • strength of the high impact absorbing zone 36 is set greater than that of the upper impact absorbing member 12 by the rib 31 and the beads 32. Therefore, the lower protruding portion 7 scoops the leg portions below the knees while absorbing a predetermined degree of impact at the high impact absorbing zone 36.
  • the pedestrian is led onto the hood of the engine compartment without a risk that the legs of the pedestrian are involved under the body 1. Consequently, a damage that would otherwise be made to the knee joints of the pedestrian is effectively reduced.
  • the upward movement of the beads 32 is regulated.
  • an impact which is larger than an impact resulting when the pedestrian is hit against the vehicle, is applied to the front bumper 2, the under cover 17 drops off from the body as quickly. After the impact absorption by the high impact absorbing zone 36 is saturated, the impact is reduced.
  • the front portion of the under cover 17 is extended so as to become the mounting bracket 25 for the bumper face 5.
  • the lower impact absorbing member 30 is formed integrally on the bracket 25. Therefore, the lower portion of the bumper face 5 is fastened to the cross member 20 of the body 1 without increasing the number of components and with the simple structure. Moreover, the appropriate impact absorbing function can be provided at the lower portion of the bumper face 5.
  • the lower impact absorbing member 30 has the rib 31 provided to raised from the bracket 25 to be opposed to the inner vertical surface of the lower protruding portion 7 and the plurality of beads 32 disposed behind the rib 31 in the longitudinal direction of the vehicle. Therefore, the impact absorbing function of the lower portion of the bumper face 5 can be adjusted easily and stably by modifying the positions where the rib 31 and the beads 32 are disposed, the thickness of the rib 31 and the beads 32 and the number of beads 32.
  • the rib 31 is extended along the inner vertical surface of the lower portion of the bumper face 5 (the inner vertical surface of the lower protruding portion 7) in substantially parallel therewith. Therefore, unevenness in impact absorbing capability that would occur from different impact positions on the lower protruding portion 7 can be prevented.
  • the rib 31 is disposed forwarder than the position where the impact absorption by the upper impact absorbing member 12 is saturated. Therefore, in case a pedestrian is hit by the vehicle, the leg portions below the knees of the pedestrian can be scooped while the impact is being absorbed by the high impact absorbing zone 36. Herewith, the pedestrian can be led onto the hood of the engine compartment without the risk that the leg portions below the knees of the pedestrian are involved under the body. Namely, it is possible to effectively reduce the damage to the knee joints of the pedestrian.
  • Fig. 5 shows a second embodiment of the present invention, being a plan view showing a main part of an under cover. Note that in this embodiment of the present invention, the structure of a lower impact absorbing member provided on a bracket 25 is different from that described in the first embodiment. The other features remain the same, and the description thereof will be omitted by imparting like reference numerals to like constituent components.
  • a lower impact absorbing member 40 has a rib 41 and a plurality of beads 42.
  • the rib 41 is raised from the bracket 25 to be opposed to an inner vertical surface of a lower protruding portion 7.
  • the plurality of beads 42 are disposed between the rib 41 and a cross member 21 for transmitting an impact from the rib 41 to the cross member 20.
  • the rib 41 is extended along the inner vertical surface of the lower protruding portion 7 in substantially parallel therewith and spaced a predetermined interval from the inner vertical surface.
  • a substantially transverse length L 1 of the rib 41 is set to be longer than a transverse length L 2 of the cross member 20.
  • the beads 42 are disposed in such a manner that it was an expanded toward the front in a sectorial shape as shown Fig.5, in association with the length L 1 of the rib 41 being set longer than the transverse length L 2 of the cross member.
  • rear sides of the beads 42 are abutted with a front side of the cross member 20.
  • Figs. 6, 7 show a third embodiment of the present invention.
  • Fig. 6 is a perspective view showing a main part of a under cover of the third embodiment of the present invention.
  • Fig. 7 is a longitudinally vertical sectional view showing a main part of a vehicle body in the vicinity of a front bumper of the third embodiment of the present invention. Note that in this embodiment the structure of beads is different from those of the beads described with reference to the first and second embodiments. The other features remain the same and therefore the description thereof will be omitted by imparting like reference numerals to like constituent components.
  • beads 50 each have a notch portion 51 in upper rear portions thereof.
  • a locking pawl 52 is formed by the formation of the notch portion 51, which projected rearward on an upper surface of the bead 51.
  • the locking pawls 52 are locked to a flange joined portion 20c of a cross member 20 which protrudes from a front side thereof, whereby the mounting position of the beads 50 relative to the cross member 20 is regulated.
  • the flange joined portion 20c on the front side of the cross member 20 functions as a locking portion to lock the locking pawls 52.
  • the locking pawls 52 can be locked onto the flange joined portion 20c when an under cover 17 is mounted on a vehicle body 1. Namely, temporary fixation of the under cover 17 and positioning of the beads 50 relative to the cross member 20 can be facilitated.
  • the lower portion of the bumper face can be fastened to the cross member and the appropriate impact absorbing function can be provided at the lower portion of the bumper face with the simple structures and without increasing the number of components.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Body Structure For Vehicles (AREA)
EP02005222A 2001-03-08 2002-03-07 Kraftfahrzeugstossfängerstruktur Expired - Lifetime EP1238862B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2001065291A JP2002264741A (ja) 2001-03-08 2001-03-08 バンパー構造
JP2001065291 2001-03-08

Publications (3)

Publication Number Publication Date
EP1238862A2 true EP1238862A2 (de) 2002-09-11
EP1238862A3 EP1238862A3 (de) 2002-10-23
EP1238862B1 EP1238862B1 (de) 2004-11-17

Family

ID=18923970

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02005222A Expired - Lifetime EP1238862B1 (de) 2001-03-08 2002-03-07 Kraftfahrzeugstossfängerstruktur

Country Status (4)

Country Link
US (1) US6893064B2 (de)
EP (1) EP1238862B1 (de)
JP (1) JP2002264741A (de)
DE (1) DE60201930T2 (de)

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WO2005100100A1 (fr) * 2004-03-16 2005-10-27 Compagnie Plastic Omnium Lot d'au moins deux appuis bas pour pare-choc de vehicule automobile, et lot de deux blocs avant
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EP1800960A3 (de) * 2005-12-21 2009-05-13 Kojima Press Industry Co., Ltd. Fußgängerschutzvorrichtung für Kraftfahrzeuge
EP2112027A1 (de) 2008-04-25 2009-10-28 Kojima Press Industry Co., Ltd. Fußgängerschutzvorrichtung für Kraftfahrzeuge
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FR2989663A1 (fr) * 2012-04-23 2013-10-25 Peugeot Citroen Automobiles Sa Vehicule avec deflecteur modulaire d'accostage de pare-choc.
FR3008373A1 (fr) * 2013-07-12 2015-01-16 Peugeot Citroen Automobiles Sa Procede de montage de la face avant d’un vehicule
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JP5585260B2 (ja) * 2010-07-20 2014-09-10 マツダ株式会社 車両の前部車体構造
JP5508211B2 (ja) * 2010-09-30 2014-05-28 富士重工業株式会社 車両用歩行者保護装置
JP5691369B2 (ja) * 2010-10-12 2015-04-01 日産自動車株式会社 車両の前部構造
US8322780B2 (en) 2010-12-20 2012-12-04 Sabic Innovative Plastics Ip B.V. Reinforced body in white and method of making and using the same
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WO2019081830A1 (fr) * 2017-10-27 2019-05-02 Psa Automobiles Sa Dispositif d'amortissement de choc avant d'un véhicule automobile, comprenant un déflecteur d'air basculant et un amortisseur déformable fixés l'un à l'autre.
FR3072925A1 (fr) * 2017-10-27 2019-05-03 Psa Automobiles Sa Dispositif d'amortissement de choc avant d'un vehicule automobile, comprenant un deflecteur d'air basculant et un amortisseur deformable fixes l'un a l''autre.

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US6893064B2 (en) 2005-05-17
DE60201930D1 (de) 2004-12-23
EP1238862B1 (de) 2004-11-17
EP1238862A3 (de) 2002-10-23
US20020125725A1 (en) 2002-09-12
DE60201930T2 (de) 2005-04-07

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